Law of octaves

Now that over sixty elements were known, the proposed Law of Octaves grouped elements based on their atomic weights in a repeating pattern, resembling musical octaves. This failed attempt helped pave the way for better-organized periodic tables.
 John Alexander Reina Newlands England 1863 Law of octaves

Now that over sixty elements were known, the proposed Law of Octaves grouped elements based on their atomic weights in a repeating pattern, resembling musical octaves. This failed attempt helped pave the way for better-organized periodic tables.